F122 水の過冷却に及ぼす超音波振動の影響(OS-6:バイオ・メディカルテクノロジーと関連した熱・物質移動現象(I))

概要

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A method to actively enhancing supercooling is one of most promising techniques for cryopreservation and material processing. The object of this paper is to study the effects of ultrasonic vibration on supercooling of water. In the experiments, water in a test tube with thermocouple was cooled at constant cooling rate, with ultrasonic irradiation at frequency of 1MHz. As the results, the enhancement of supercooling was not achieved, while the release effect of supercooling increased with increasing ultrasonic power. The nucleation site is also shifted from thermocouple to wall surface due to heating effect induced by sound absorption. It was suggested the periodically-varying ultrasonic vibration would induced some effect on supercooling.
2010-10-29